Force-Controlled Shock Absorber with Hydraulic Pump Drive
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Solution Overview
Problem
Existing 2-pipe shock absorbers are limited to specific uses due to fixed properties and cannot be easily adapted for different applications, lacking the ability to adjust damping forces and seat height dynamically.
Innovation Solution
Incorporating a hydraulic pump drive between the chambers of the shock absorber, allowing for adaptive control of flow resistance and damping forces, enabling operation in passive, active, and semi-active modes, with optional solenoid or proportional flow control valves for adjustable damping, and a leakage pipe for pressure management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a 2-pipe shock absorber is designed with fixed valve arrangements, then the manufacturing precision and reliability are improved, but the adaptability to different applications deteriorates
Solution Approach 1:
The patent applies dynamics by making the valve arrangements adjustable rather than fixed. The valve openings can be modified during operation or assembly to change damping characteristics, allowing the same shock absorber to adapt to different applications while maintaining reliable operation through controlled adjustment mechanisms
Solution Approach 2:
The patent changes the parameter of valve opening size to enable adaptability. By allowing the valve arrangements to have variable openings, the damping forces can be adjusted for different applications without changing the basic shock absorber structure, thus maintaining reliability while improving versatility
2Force
If the flow resistance is increased to improve damping performance, then the damping force is improved, but the working medium consumption increases
Solution Approach 1:
The patent applies parameter changes by allowing dynamic adjustment of valve openings to optimize the balance between damping force and working medium consumption. The valve arrangements can be adjusted to provide high damping force when needed while minimizing oil flow and consumption during normal operation
Solution Approach 2:
The patent uses dynamics by implementing adjustable valve arrangements that can adapt their flow resistance characteristics. This allows the system to maintain high damping force when required while reducing working medium consumption during less demanding phases, creating an optimal balance between the two parameters
3Force
If the valve cross section is reduced to increase flow resistance, then the damping performance is improved, but the risk of cavitation increases
Solution Approach 1:
The patent applies parameter changes by allowing the valve cross section to be dynamically adjusted. The valve arrangements can be set to provide sufficient flow resistance for good damping performance while maintaining a minimum opening size that prevents cavitation, thus resolving the contradiction between damping performance and cavitation risk
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables flexible use in various applications, including vehicle suspension and seat damping, with adjustable damping forces and seat height correction, reducing working medium consumption and preventing cavitation, while maintaining a closed oil circuit.
Implementation Method 1
a hydraulic pump drive (15, 16) arranged between an upper chamber (4) and a lower chamber (3) of the inner pipe (2)
Implementation Method 2
a valve arrangement (9) arranged on the piston (5), by means of which a working medium received in the inner pipe (2) can flow out of the lower chamber (3) into the upper chamber (4) and vice versa when the piston is moved in the inner pipe
Implementation Method 3
Shock absorbers of this kind according to prior art are usually called 2-pipe shock absorbers. 2-pipe shock absorbers of this kind are used as passive shock absorbers
Data Source
AI summary
The invention relates to a shock absorber with a housing, an inner pipe arranged in the housing, a piston rod, a piston which is arranged at that end of the piston rod, and which piston divides the interior of the inner pipe into a lower chamber and an upper chamber, a first valve arrangement which is arranged on the piston, and a third valve arrangement which is arranged at the lower end of the inner pipe and by means of which the working medium which is held in the interior of the housing, serving as a tank, can flow out of the interior of the housing, only into the lower chamber when the piston moves in the inner pipe. The shock absorber is distinguished by the fact that a hydraulic pump drive is arranged between a first connection element of the lower chamber of the inner pipe and a second connection element at the upper chamber of the inner pipe.